Throttle.



No. 658,|60. Patented Sept. I8, 1900.

H. SCHTZE.

THHGTTLE.

(Application 619:1 ne. 2a, 1899.)

2 Sheets-Shed 2.

(No Model.)

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UNrTED STATES AParenti* QFFICE.

HERMANN. SCHTZE, OF'BREMERHAVEN, GERMANY.

SPECIFICATION forming part of Letters Patent No. 658,160, meer september 1s, ieoo. Application filed December 28, 1899. Serial No. 741,786. (No model.) I

To all whom t mayooncern:

Be it known that I, HERMANNSCHTZE, manager of the gas and Water works of Bremerhaven, a citizen-of theIfree-town of Bremen, residing at Bremerhaven,Germany,`

have invented certainfnew and usefulr Improvements in Devices for Automatically Shutting OE the SteamofBoilersin Case ofy The main feature of the invention con#` sists of the arrangement of a receiver on the outer (upper)or lateral boiler-shell,which may be termed an accumulator and-is filled inA its normal condition with steamhaving the same tension as that contained in the boiler,

but which in case of an explosionmaintains, when the tension in the pipe-conduit and in the boiler is suddenly` reduced, a higher tension, serving to shutoff the steam-conduit in the interior of the boiler by means of a suitable device.

In the accompanying drawings, Figure lis a vertical cross-sectionofpart of ya boiler provided with my improved shutting-olf mechanism on line A B', Fig. 3. Fig. 2 isa crosssection on line C D, Fig. 3. Fig. 3 is a plan of the accumulator B,With the cover removed; Fig. 1l, a detail vertical section through slidevalve a; Fig. 4a, a horizontal section of the cumulator) S, leading to the engines. Above this double-seat check-valve there is connected or riveted to the outer shell of the boiler a receiver (accumulator) B. The spindle o2 of the cheek-valve passes through an aperture ,of the boiler-shell and through the bottom of the accumulator B into the interior of the latter. The passage of the valve-spindle v2 through the bottom of the accumulator is tightened by means of astufling-box.

To the upper end of thespindle 12g-fis secured a cross-bar r, Fig.2, carryingon both ends rollers'r, engaging into two voblique slots Z', provided in plates Z, which are guided on rollers fm. The ends of these Vtwo lplates Z 'are rigidly connected with each other by orossbars Z8 Z9. The crossbar Z8 isifconnected with thepiston-rod Z2 and? the lattery with the piston'k, sliding in =the cylinder c. The lengthening-piece of the piston-rod- Z2 is passed, by means of a stuffing-box, through the bottom of the cylinder e, and at .the outside it is provided Witha handle Z3. The cross-bar Z9 is connected to a drawing-rod Z4, provided With a handle Z5, which-is led, by means of a stuffing box, through the front Wall of the accumulator B. By means of the handles Z8 and Z5 the plates guided betweenl `rollers m can be moved to and fro, and it results therefrom an opening and closing of the check-valve o o', asowing to the slot Z, arranged in plates Z, the valve-spindle o2 is raised and lowered. The passage of the lengthened piston-rod Z2 through the bottom of the cylinder e and the passage of the drawing-rod Z4 through the opposite front .wall of the accumulator (having the same diameters) have, however, not only for their purposes to allow of moving the valve by hand, but it has principally to effect that the equilibrium, and in consequence thereof also the working of the automatic check device, be insured at a determined difference of tension between the steam of the accumulator and of the conduit, also when an explosion takes place ata moment where the usual Working pressure in the boiler is reduced by contrary winds or by the failing of the exhausters of the chimneyV or by the periodical formation of slag on the grates, dac., gradually to a small number of atmospheres.

IOO

Below the cylinder e a second cylinder p is arranged, which is in communication with the first cylinder e by duct e', as shown in Fig. l. In this cylinder p slides a piston 7c', connected by a drawing-rod and yoke 7a2 with a valve a sliding in a cylinder a, open on both sides and arranged in the accumulator B. The working of this slide-valve d will hereinafter be more fully described. As above already said, the cylinders aand 1J are in communication with each other. By aconduit q these two cylinders are connected with the steam-collector S, as illustrated in Fig. 3. If an explosion of a pipe or another explosion occurs, the pressure will be reduced on account of the sudden violent escape of steam, first in the steam-collector S, and then also in the steam-boiler. The pressure will therefore be lower than in the accumulator B, for the steam in the accumulator B can return only slowly through the small section ofthe boring o into the interior of the boiler, so that in any case where the cross-section of the aperture suddenly produced by the explosion is larger than the cross-section of the boring o the production of a corresponding overpressure in the accumulator B is insured. In the conduit-pipe q there is at the same time a low pressure, likewise also in the cylinders e and p, being in communication with the conduit q. In consequence thereof the pistons la and 7a' are moved by the overpressure in the accumulator B to the left. By this motion to the left of the piston 7a the valve-spindle u2 is raised and the double valve 'u o' closed. Owing to the simultaneous motion to the left of the piston k the valve a', which mediates in normal working the communication of the steam between the interior of the boiler and the accumulator B through the boring o, shuts off, on one hand, this communication but puts,on the other hand, by means of the recess a2 and of the conduit-pipe Z, the conduit q in communication with the chimney, so that the steam contained in the broken conduit is led away and rendered innocuous. If after the damage caused by the explosion has been repaired working steam is to be introduced again into the collecting-pipe, the steam inclosed in the accumulator B is caused to How through the cock q into the collecting-pipe and the doubleseat valve o o is opened by moving the handles z3 .e5 to the right.

All the check devices of the boilers of a ship may be connected to the conduit q,which is filled with steam from the steam-collector S,and separately be cut 01T by means of cocks. By this invention the result is obtained that in case of an explosion all the steam-boilers of a ship can be cut off at the same time.

In order that the steam introduced through the pipe-conduit q has in the cylinders @and p always the same tension as the steam in the accumulator B, it is led through a heater 7l, arranged in the interior of the accumulator B--that is tosay,it is supplementarily heated, so that the same pressure is in the accumulatorB as in the cylinders e and 79. The bores a: Qc m, Fig. l, at the left hand, which are in communication with the interior of the accumulator, serve also to heat the cylinders e and p for maintaining the steam therein at the tension of the steam in the accumulator B.

If steam coming from the steam-collector S were used Without being heated supplementarily, a precise working of the check device would not be possible, as the conduit q, leading this steam from the steam-collector S to the cylinders e and p, is exposed on its way, more or less, to cooling. In case of rupture of a pipe-conduit the steam of a boiler is therefore cut off automatically and with certainty by the described device. In this case or at any other moment of danger, in particular when a rupture occurs in stopped machines, where no flow of steam takes place in the conduits and where the production of a dierence of pressure necessary for actuating the safety device is uncertain, the latter can be put in action by hand from any room of the ship by cooling the pipe-conduit p in a high degree at any proper place, so that a partial condensation,and in consequence thereof a decrease of the pressure, is obtained in the conduit q. The result therefore, as above described, isaclosing of the check-valvet o. In Fig. 3 there is provided in the conduit q at c a loop,which is inclosed bya receiver c'. Into this receiver water is introduced from any suitable water-tank w, Fig. 3, by opening a cock h, so that the conduit q is cooled on the corresponding place and the tension of the steam contained therein reduced. The conduits of water leading to the cooling-place of the pipe q may be arranged in several parts of the ship, so that it is only necessary to open the cock 71 provided at the corresponding place for putting the safety device in activity.

If more check devices are used for one boiler-battery, it is not necessary to try regularly all these devices in order to know whether the resistances in their mechanisms have increased. It will be sufcient to examine in this respect only one device, for by the regular working of one device all the other ones connected with the common conduit q are set to work 4with absolute certainty, `as the steam contained in the conduit q is led away by means of a valve a into the chimney, so that the left surfaces of all the pistons 7c, Fig. 1, are completely released and put in motion.

l. The combination of a boiler with an accumulator, means for connecting the boiler with the accumulator, a piston actuated by an excess of steam-pressure in the accumulator, and a steam-controlling valve actuated by the piston, substantially as speciiied.

2. The combination of a boiler with an accumulator, a slide-valve that normally connects the boiler with theaccumulator, a piston actuated by an excess of steam-pressure IOO IIO

able therein, means for connecting the piston with the steam-controlling Valve, a steampipe having a loop and communicating with the cylinder, and a cooling-reservoir inclosing the loop, substantially as specied.

In Witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

HERMANN SCHTZE. Witnessesi A. RoHAc, H. BEHREND. 

